This is a great little script that I found on GitHub by PixelsHQ which will automatically register each of the PHP running sites on a shared server as individual applications (using the domain name) on NewRelic. Click here to view the script.
https://github.com/pixlsHQ/plesk.templates.newrelic
NewRelic Resources for Plesk
This is a great resource by NewRelic on setting your directory PHP ini setting setup for Apache, NGINX, and PHP-FPM
